Attached Link: http://www.petersharpe.com/Tutorial16.htm

I just tried that idea about the rain texture but it doesn't give the effect I'm looking for. Basically, the idea I had was to follow Peter Sharpe's snow tutorial (see link) but swap "Blue Dots" for a similar image of snowflakes (ie, instead of blue dots on a white background, blue snowflakes on a white background). The idea was to have the same falling snow effect but each white dot would actually be a snowflake.